Medium Voltage High-Power Converter Topology for the Large Permanent Magnet Wind Generator Systems
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2013, Vol 2, Issue 9
Abstract
This paper proposes a modular, medium voltage, highpower converter topology for the large permanent magnet wind generator system, eliminating the grid-side step-up transformer, which is desirable for both onshore and offshore wind turbines. The power conversion systems for large wind turbines are facing a great challenge as today’s wind turbine power outputs approach 5 MW and above. The conventional low voltage power conversion system will suffer from a high transmission current, which significantly increases losses and cost of the cables as well as voltage drop. The converter modules are cascaded to achieve medium voltage output. Each converter module is fed by a pair of generator coils with 90 phase shift to get the stable dc-link power. At the grid-side, H-bridge inverters are connected in series to generate multilevel medium voltage output and the voltageoriented vector control scheme is adopted to regulate the converter active and reactive power transferred to the grid. The power factor correcn (PFC) circuit enables the generator to achieve unity power factor operation and the generator armature inductance is used as ac-side PFC boost inductance. Simulation results with a 2-MW wind turbine system and experimental results with a down-scaled 3-kW system validate the proposed topology and control methods. The proposed system can successfully deliver power from the wind generator to the grid.
Authors and Affiliations
Burra Vamsi, Sk. Sadik Ahamad Khan, B. Rajasekhar Reddy, V. Kishorekumar Reddy V
Keywords
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